The Scary Teeth is a TV-Tropes-popularized term about typical characteristic of a character, includes a villain whose teeth looked disturbing if they revealed it. Reasons are vary, ranging from:
- Being rotten as result of poor hygiene.
- Having a mouthful of sharp teeth similar with that of carnivorous animals like sharks, lions, etc., due to either malformed when born or naturally(should one is not a human).
- A number of teeth to whole tooth replaced with durable fake teeth/fake tooth that made one's grin scary due to material used or models.
- No longer have teeth, either due to the first reason above or worse, injuries by either accident or fight with a hero.
In either way, having scary teeth would made a character's smile would disturbing and even instilled fear or warned the hero/good guys the indication that trusting the said character is debatable.